﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Xml.Serialization;
namespace Skainix.SerializationUtils
{
	[XmlRoot("dictionary")]
	public class SerializableDictionary<TKey, TValue> : Dictionary<TKey, TValue>, IXmlSerializable
	{
		#region IXmlSerializable Members
		public System.Xml.Schema.XmlSchema GetSchema()
		{

			return null;

		}

		public void ReadXml(System.Xml.XmlReader reader)
		{
			XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
			XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));
			
			bool wasEmpty = reader.IsEmptyElement;

			reader.Read();

			if (wasEmpty)
			{
				return;
			}		  

			while (reader.NodeType != System.Xml.XmlNodeType.EndElement)
			{
				reader.ReadStartElement("item");
				reader.ReadStartElement("key");
				
				TKey key = (TKey)keySerializer.Deserialize(reader);

				reader.ReadEndElement();
				reader.ReadStartElement("value");

				TValue value = (TValue)valueSerializer.Deserialize(reader);

				reader.ReadEndElement();
				
				this.Add(key, value);
				
				reader.ReadEndElement();
				reader.MoveToContent();

			}

			reader.ReadEndElement();
		}
		
		public void WriteXml(System.Xml.XmlWriter writer)
		{
			XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
			XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));
			
			foreach (TKey key in this.Keys)
			{
				writer.WriteStartElement("item");
				writer.WriteStartElement("key");

				keySerializer.Serialize(writer, key);
				writer.WriteEndElement();
				
				writer.WriteStartElement("value");
				TValue value = this[key];
				valueSerializer.Serialize(writer, value);
				writer.WriteEndElement();
				
				writer.WriteEndElement();
			}

		}

		#endregion

	}
}

